text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  const common = require('../common');
  const assert = require('assert');
  const { spawn } = require('child_process');
  
  // Test stdio piping.
  {
    const child = spawn(...common.pwdCommand, { stdio: ['pipe'] });
    assert.notStrictEqual(child.stdout, null);
    assert.notStrictEqual(child.stderr, null);
  }
  
  // Test stdio ignoring.
  {
    const child = spawn(...common.pwdCommand, { stdio: 'ignore' });
    assert.strictEqual(child.stdout, null);
    assert.strictEqual(child.stderr, null);
  }
  
  // Asset options invariance.
  {
    const options = { stdio: 'ignore' };
    spawn(...common.pwdCommand, options);
    assert.deepStrictEqual(options, { stdio: 'ignore' });
  }
  
  // Test stdout buffering.
  {
    let output = '';
    const child = spawn(...common.pwdCommand);
  
    child.stdout.setEncoding('utf8');
    child.stdout.on('data', function(s) {
      output += s;
    });
  
    child.on('exit', common.mustCall(function(code) {
      assert.strictEqual(code, 0);
    }));
  
    child.on('close', common.mustCall(function() {
      assert.strictEqual(true, output.length > 1);
      assert.strictEqual('\n', output[output.length - 1]);
    }));
  }
  
  // Assert only one IPC pipe allowed.
  common.expectsError(
    () => {
      spawn(
        ...common.pwdCommand,
        { stdio: ['pipe', 'pipe', 'pipe', 'ipc', 'ipc'] }
      );
    },
    { code: 'ERR_IPC_ONE_PIPE', type: Error }
  );
  